Cabletron Systems 100BASE-FX, Cabling Manual

Page: 163 / 192

Token Ring 14-13
Connecting and Terminating
ST Connector
The instructions which follow detail the process used to connect a set of ST
connectors to a station port.
ST connectors for fiber optic cables are connected to ST ports on devices through a
“twist and lock” procedure.
Each fiber optic link consists of two strands of fiber optic cabling: the transmit
(TX) and the receive (RX). The transmit strand from a module port connects to the
receive port of a fiber optic Ethernet device at the other end of the segment. The
receive strand of the applicable port on the module connects to the transmit port
of the fiber optic Ethernet device.
Cabletron Systems recommends labeling fiber optic cables to indicate receive and
transmit ends. Many cables are prelabeled, providing matching labels or tapes at
both ends of each strand of cable.
1. Remove the protective plastic covers from the fiber optic ports on the
applicable port on the module, and from the ends of the connectors on each
fiber strand.
2. Attach one fiber to the applicable receive port on the module. Insert the ST
connector into the port with the alignment slot on the connector inserted over
the locking key on the port. Turn the connector clockwise to lock it down.
Figure 14-10. ST Connector Insertion
3. Attach the other fiber of the pair to the applicable transmit port on the module.
Use the same procedure for insertion of the ST connector.
4. At the other end of the fiber optic cable, attach the fiber pair to the transmit
and receive ports of the device.
!
C AUT IO N
Do not touch the ends of the fiber optic strands, and do not let
the ends come in contact with dust, dirt, or other contaminants.
Contamination of cable ends causes problems in data
transmissions. If necessary, clean contaminated cable ends
using isopropyl alcohol and a soft, clean, lint-free cloth.
1845n48